Below Crystal Springs Dam, lower San Mateo Creek receives limited flows from Lower Crystal Springs Reservoir and descends to the Bay.
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The original name of the southern or Upper Crystal Springs Reservoir was Laguna Grande, which has a California Historical Marker ("NO. 94 PORTOLA EXPEDITION CAMP - The Portolà expedition of 1769 camped on November 5 at a 'laguna grande' which today is covered by the Upper Crystal Springs Lake.") located at Crystal Springs Dam on Skyline Boulevard, 0.1 mi south of Crystal Springs Road.
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In one serpentine soil location near Crystal Springs Reservoir, it passes near one of the only known colonies of the endangered wildflower Pentachaeta bellidiflora and near one of the limited number of colonies of the endangered Eriophyllum latilobum.
It is currently known only to survive in serpentine bunchgrass communities and native prairies in two small areas of San Mateo County, including populations in Edgewood County Park and on San Francisco Water District lands at serpentine outcrops on the eastern slopes of Crystal Springs Reservoir, in the vicinity of State Route 92.
This 6 mile (10 km) trail eventually reaches the eastern shores of the Lower Crystal Springs reservoir and the Crystal Springs Dam.